Umm....They wern't intending to keep it open, since botting was so easy and rs2 had become primary. Mod dave I think it might be requested if he could update it and make it better then open it for players again.
Since their are few rsc servers running I suspect Jagex don't want it flooded
By people "seeing what its like" then never playing again.
6th is soon so it will be open again for a week or two.